Because you submit a SUBSCRIBE request to a group but not each member of the group, you still receive SIP NOTIFY messages whenever the group changes.
由于向组提交SUBSCRIBE请求，而不是向组的每个成员提交请求，因此仍然能在组发生更改时接收到SIPNOTIFY消息。
When you have to notify multiple object managers of an event at the same time, a publish-subscribe paradigm is best suited for your communication needs.
如果必须将一个事件同时通知多个对象管理器，那么使用发布-订阅模型是最合适的。
This model offers SIP Specific Event Notification to transmit DTMF, and USES SUBSCRIBE and NOTIFY to realize the control to IP phone.
该模型利用事件通告机制来传送双音多频信号，通过SUBSCRIBE和NOTIFY两个消息来实现交换机对SIP终端的完全控制。
This model offers SIP Specific Event Notification to transmit DTMF, and USES SUBSCRIBE and NOTIFY to realize the control to IP phone.
该模型利用事件通告机制来传送双音多频信号，通过SUBSCRIBE和NOTIFY两个消息来实现交换机对SIP终端的完全控制。
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